How can I prove I’ve completed the challenge? Expand You don’t need to prove you’ve completed the challenge – we trust you! Once you have completed your challenge, please email us at [email protected] and we will then send out your medal. You can post videos, pictures, and updates on your social media and tag it with #MakeASplash1891. Sharing updates is a great way to show those who have sponsored you that you’re committed to completing the challenge.